Light bulb filament



FIG. 1 is a perspective front View of a light bulb filament;

FIG. 2 is a left side View thereof;

FIG. 3 is a front View thereof;

FIG. 4 is a right side View thereof;

FIG. 5 is a rear View thereof;

FIG. 6 is a top plan View thereof;

FIG. 7 is a bottom plan View thereof; and,

FIG. 8 is a perspective rear View thereof.

The broken line showing of the other portions of the bulb is included for the purpose of illustrating only and forms no part of the claimed design. 

CLAIM “The ornamental design for a light bulb filament, as shown and described”. 